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Loans and allowance for credit losses - Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | $ 7,082,959 | $ 4,409,642 | $ 4,409,642 | $ 3,667,511 |
Less: Allowance for credit losses | (170,389) | $ (31,139) | (31,139) | (28,932) | $ (24,041)
Net loans | 6,912,570 |  | 4,378,503 |  |
Loans originated as part of PPP program | 212,645 |  |  |  |
Paycheck Protection Program |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans originated as part of PPP program | 212,645 |  |  |  |
Commercial and industrial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 1,346,122 |  | 1,034,036 | 867,083 |
Less: Allowance for credit losses | (14,748) |  | (4,805) | (5,348) | (4,461)
Construction |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 1,222,220 |  | 551,101 | 556,051 |
Less: Allowance for credit losses | (58,477) |  | (10,194) | (9,729) | (7,135)
Residential real estate | 1-to-4 family mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 1,089,270 |  | 710,454 | 555,815 |
Less: Allowance for credit losses | (19,220) |  | (3,112) | (3,428) | (3,197)
Residential real estate | Residential line of credit |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 408,211 |  | 221,530 | 190,480 |
Less: Allowance for credit losses | (10,534) |  | (752) | (811) | (944)
Residential real estate | Multi-family mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 175,676 |  | 69,429 | 75,457 |
Less: Allowance for credit losses | (7,174) |  | (544) | (566) | (434)
Residential real estate | Non-owner occupied |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 1,598,979 |  |  |  |
Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 924,841 |  |  |  |
Commercial real estate | Owner occupied |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 924,841 |  | 630,270 | 493,524 |
Less: Allowance for credit losses | (4,849) |  | (4,109) | (3,132) | (3,558)
Commercial real estate | Non-owner occupied |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 1,598,979 |  | 920,744 | 700,248 |
Less: Allowance for credit losses | (44,147) |  | (4,621) | (4,149) | (2,817)
Consumer and other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Gross loans | 317,640 |  | 272,078 | 228,853 |
Less: Allowance for credit losses | $ (11,240) |  | $ (3,002) | $ (1,769) | $ (1,495)

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